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o-na [289]
3 years ago
12

25 Points 9 -3=7(-3)

Mathematics
1 answer:
Ksju [112]3 years ago
8 0
I think the answer is: 6 = -21
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Mademuasel [1]

Answer:

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Step-by-step explanation:

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A recent survey showed that in a sample of 100 elementary school teachers, 15 were single. In a sample of 180 high school teache
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Answer:

By using hypothesis test at α = 0.01, we cannot conclude that the proportion of high school teachers who were single greater than the proportion of elementary teachers who were single

Step-by-step explanation:

let p1  be the proportion of elementary teachers who were single

let p2 be the proportion of high school teachers who were single

Then, the null and alternative hypotheses are:

H_{0}: p2=p1

H_{a}: p2>p1

We need to calculate the test statistic of the sample proportion for elementary teachers who were single.

It can be calculated as follows:

\frac{p(s)-p}{\sqrt{\frac{p*(1-p)}{N} } } where

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  • p is the proportion of elementary teachers who were single (\frac{15}{100} =0.15)
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\frac{0.2-0.15}{\sqrt{\frac{0.15*0.85}{180} } } ≈ 1.88

Using z-table, corresponding  P-Value is ≈0.03

Since 0.03>0.01 we fail to reject the null hypothesis. (The result is not significant at α = 0.01)

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3 years ago
X^2+3x+2<br><br> x^2+x-6<br><br> x^2-x-2
Varvara68 [4.7K]

Answer:

1. (+1)(+2)

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Step-by-step explanation:

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3 years ago
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Answer:

x = 30

Step-by-step explanation:

-2x + 10 +4x=70

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-2x + 4x = 60

2x = 60

/2      /2

x = 30

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Step-by-step explanation:

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3 years ago
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